1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
bifish(1) Scilab Function bifish(1)
NAME
bifish - shows a bifurcation diagram in a fish population discrete time
model
CALLING SEQUENCE
bifish([f_ch])
PARAMETERS
f_ch : can be one of fish, fishr and fishr2. This option selects the popu-
lation model.
DESCRIPTION
The dynamical system fish is the following :
y=b*exp(-0.1*(x(k)_1+x(k)_2));
x(k+1)=[ y 2*y ; s 0.0]*x(k);
and the parameters s evolves to show the bifurcation diagram. fishr and
fishr2 are constructed as above but with added white noises.
fishr
y=b*exp(-0.1*(xk(1)+xk(2)))
xkp1=[ y 2*y ; s*(1+0.1*(rand-0.5)) 0.0]*xk
fishr2
z=exp(-0.1*(xk(1)+xk(2)))
xkp1=[ b*z**(1+0.1*(rand-0.5)) 2*b*z**(1+0.1*(rand-0.5)) ; s 0.0]*xk
The three macros fish, fishr, fishr2 are loaded in Scilab when calling bif-
ish.
SEE ALSO
ode
|
